There is nothing New about Convex Grinds or Convex Edges. All Knives-Swords-Axes and Cutting Tools have been Convex Ground and Sharpened from the Bronze Age to about 1900. The Advent of Automated Grinding during the Industrial Revolution saw the first V-Bevel methods of Sharpening knives. This was necessary because there are no machines–even today–that can do a proper Convex Grind or Convex Edge.